diff --git a/backend/open_webui/models/chats.py b/backend/open_webui/models/chats.py
index fd13a680a8..978cb2948f 100644
--- a/backend/open_webui/models/chats.py
+++ b/backend/open_webui/models/chats.py
@@ -2558,7 +2558,7 @@ class ChatTable:
         file_ids: list[str],
         user_id: str,
         db: AsyncSession | None = None,
-    ) -> list[ChatFileModel | None]:
+    ) -> list[ChatFileModel] | None:
         if not file_ids:
             return None